80780805 has 96 divisors (see below), whose sum is σ = 170726400. Its totient is φ = 34546176.

The previous prime is 80780803. The next prime is 80780813. The reversal of 80780805 is 50808708.

It is not a de Polignac number, because 80780805 - 2¹ = 80780803 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80780805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80780803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 337876 + ... + 338114.

It is an arithmetic number, because the mean of its divisors is an integer number (1778400).

Almost surely, 2^80780805 is an apocalyptic number.

It is an amenable number.

80780805 is an abundant number, since it is smaller than the sum of its proper divisors (89945595).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

80780805 is a wasteful number, since it uses less digits than its factorization.

80780805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 80780805 is about 8987.8142504171. The cubic root of 80780805 is about 432.2842297484.

The spelling of 80780805 in words is "eighty million, seven hundred eighty thousand, eight hundred five".